Add logic ops according to OpenGL ES 1.1 spec and 3dbrew.

src/video_core/math.h

@@ -424,6 +424,27 @@ public:
         return x*x + y*y + z*z + w*w;
     }
     
+    // Needed for logic ops
+    Vec4<decltype(~T{})> operator ~() const
+    {
+        return MakeVec(~x,~y,~z,~w);
+    }
+    
+    Vec4<decltype(T{}&T{})> operator &(const Vec4& other) const
+    {
+        return MakeVec(x&other.x, y&other.y, z&other.z, w&other.w);
+    }
+    
+    Vec4<decltype(T{}|T{})> operator |(const Vec4& other) const
+    {
+        return MakeVec(x|other.x, y|other.y, z|other.z, w|other.w);
+    }
+    
+    Vec4<decltype(T{}^T{})> operator ^(const Vec4& other) const
+    {
+        return MakeVec(x^other.x, y^other.y, z^other.z, w^other.w);
+    }
+
     // Only implemented for T=float
     float Length() const;
     void SetLength(const float l);

src/video_core/pica.h

@@ -374,7 +374,22 @@ struct Regs {
 
         union {
             enum Op {
+                Clear = 0,
+                And = 1,
+                AndReverse = 2,
+                Copy = 3,
                 Set = 4,
+                CopyInverted = 5,
+                NoOp = 6,
+                Invert = 7,
+                Nand = 8,
+                Or = 9,
+                Nor = 10,
+                Xor = 11,
+                Equiv = 12,
+                AndInverted = 13,
+                OrReverse = 14,
+                OrInverted = 15,
             };
 
             BitField<0, 4, Op> op;

src/video_core/rasterizer.cpp

@@ -778,8 +778,87 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
                 blend_output     = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_rgb);
                 blend_output.a() = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_a).a();
             } else {
-                LOG_CRITICAL(HW_GPU, "logic op: %x", registers.output_merger.logic_op);
-                UNIMPLEMENTED();
+                auto params = registers.output_merger.logic_op;
+
+                using LogicOp = decltype(params)::Op;
+
+                auto EvaluateLogicOp = [&](const Math::Vec4<u8>& src, const Math::Vec4<u8>& dest
+                                           LogicOp op) -> Math::Vec4<u8> {
+                    Math::Vec4<u8> result;
+                    
+                    switch(op) {
+                    case LogicOp::Clear:
+                        result = Math::Vec4<u8>(0,0,0,0);
+                        break;
+                    
+                    case LogicOp::And:
+                        result = src & dest;
+                        break;
+                    
+                    case LogicOp::AndReverse:
+                        result = src & ~dest;
+                        break;
+                    
+                    case LogicOp::Copy:
+                        result = src;
+                        break;
+                    
+                    case LogicOp::Set:
+                        result = Math::Vec4<u8>(1,1,1,1);
+                        break;
+                    
+                    case LogicOp::CopyInverted:
+                        result = ~src;
+                        break;
+                    
+                    case LogicOp::NoOp:
+                        result = dest;
+                        break;
+                    
+                    case LogicOp::Invert:
+                        result = ~dest;
+                        break;
+                    
+                    case LogicOp::Nand:
+                        result = ~(src & dest);
+                        break;
+                    
+                    case LogicOp::Or:
+                        result = src | dest;
+                        break;
+                    
+                    case LogicOp::Nor:
+                        result = ~(src | dest);
+                        break;
+                    
+                    case LogicOp::Xor:
+                        result = src ^ dest;
+                        break;
+                    
+                    case LogicOp::Equiv:
+                        result = ~(src ^ dest);
+                        break;
+                    
+                    case LogicOp::AndInverted:
+                        result = ~src & dest;
+                        break;
+                    
+                    case LogicOp::OrReverse:
+                        result = src | ~dest;
+                        break;
+                    
+                    case LogicOp::OrInverted:
+                        result = ~src | dest;
+                        break;
+                    default:
+                        LOG_CRITICAL(HW_GPU, "Unknown logic op %x", op);
+                        UNIMPLEMENTED();
+                    }
+                    
+                    return result;
+                };
+                
+                blend_output = EvaluateLogicOp(combiner_output, dest, params.op);
             }
 
             const Math::Vec4<u8> result = {